CD-ROM and DVD-R (or DVD R) marked on the disk are disposable discs and cannot be burned repeatedly. CD-RW, DVD-RW (or DVD RW) discs are rewritable and can be burned repeatedly.
There are many types of discs. Take the common DVD discs we burn as follows: DVD-R, DVD-RW, DVD R, DVD RW .
What are the differences between these types of discs, which types of discs can be reused, and how to erase the disc and then burn it again if it is burned repeatedly?
Optical discs use optical information as a carrier for storage. An item used to store data. Divided into non-rewritable optical discs, such as CD-ROM, DVD-ROM, etc.; and rewritable optical discs, such as CD-RW, DVD-RAM, etc.
DVD-Rstands for DVD-Recordable. In order to distinguish it from DVD R, the industry defines it as Write once DVD. ). DVD-R/RW is Pioneer's main DVD recording format and is supported by Toshiba, Hitachi, NEC, Samsung and the DVD Forum (DVD FORUM). However, unlike CD-R, DVD-R currently has two types, namely Authoring and General. The main physical difference between the two is the wavelength of the recording laser, so each requires its own dedicated recorder to write to it. However, as long as the recording is completed, it can be played on a traditional DVD player.
DVD-RWstands for DVD-ReWritable, but in order to distinguish it from DVD RW, the industry defines it as Re-recordable DVD. DVD). The DVD-RW standard was proposed by Pioneer in 1998 and received strong support from the DVD Forum. Its members include manufacturers such as Apple, Hitachi, NEC, Samsung and Panasonic, and version 1.1 was completed in mid-2000. Formal standards. DVD-RW products were originally positioned as consumer electronics products, mainly providing functions similar to VHS video tapes, and can record high-quality multimedia video information for consumers. However, with the development of technology, the functions of DVD-RW have gradually expanded to the computer field. The main difference between version 1.1 and version 1.0 is the added support for CPRM copyright protection technology.
DVD R(Digital Versatile Disc Recordable) is one of the writable disc formats. The nominal capacity of a single layer is 4.7GB, and the actual capacity is 4.38G=4482.625MB=4,700,372,992 bytes (a total of 2,295,104 segments, each segment contains 2,048 bytes). The dual-layer nominal capacity is 8.5GB, and the actual capacity is 7.96G=8,152MB=8,547,991,552 bytes (4,173,824 segments, each segment contains 2,048 bytes).
DVD RWNowadays, there are mainly discs in different formats such as DVD-R/DVD-RW and DVD R/DVD RW. At present, the more common types in the domestic market include DVD-R, DVD R, DVD-RW, DVD RW, DVD-R DL, DVD R DL, and DVD-ROM, as well as DVD-RAM, which is less common in the domestic market. Next, we will introduce the differences between these formats in detail.
DVD-R/RWis one of the DVD burning technologies developed by the Japanese Pioneer Company and certified by the DVD Forum (the current DVD format standard is mainly determined by this organization). The full name of DVD-R is DVD-Recordable (recordable DVD). To distinguish it from DVD R, it is defined as Write once DVD (write-once DVD). The full name of DVD-RW is DVD-ReWritable (rewritable DVD). To distinguish it from DVD RW, it is defined as Re-recordable DVD (re-recordable DVD). The current market price of DVD-R format discs ranges from 2 yuan to 10 yuan depending on the brand and packaging, while the price of rewritable DVD-RW discs is mostly around 20 yuan.
DVD R/RWis a DVD RW Alliance organization jointly created by Sony, Philips, and HP (different from the DVD Forum mentioned above, it is another DVD that competes with it. Standards Development Organization). To distinguish it from DVD-R/RW, DVD R is called DVD Recordable (recordable DVD), and DVD RW is called DVD ReWritable (rewritable DVD). DVD R/RW and DVD-R/RW are only different in format, so the prices are also similar.
DVD /-R DLis a single-sided double-layer recording (DVD /-Recordable Double layer) compared to the ordinary single-sided single-layer 4.7G, which has two storage layers. Compared with ordinary single-sided single-layer recording disks, the storage capacity has been expanded to 8.5G. However, due to technical problems, there are very few manufacturers producing such disks.
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